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My camera is pink, and my mobile phone is black.
Is it right? And why yes or why not?
Or:
My camera is small. my phone is small, too.
Are these commas correct?
When can I find the answers? Is there any grammar book, which can explain it to me?
Thank you.
You are correct:
My camera is pink, and my mobile phone is black.
These are two independent clauses, joined by a comma and the word and. This is the textbook example of how to correctly join two independent clauses with a coordinating conjunction.
By contrast:
My camera is small. my phone is small, too.
This is incorrect. You finished the first sentence (because it ended with a period) but then started the second sentence with a lowercase letter. If you want to join these two sentences (independent clauses) into a single sentence without using a coordinating conjunction (e.g. and), you can use a semicolon:
My camera is small; my phone is small, too.
My camera is pink; my mobile phone is black.
For comma usage rules, I would start with a search engine and the web. Here's a place to start: http://www.grammarbook.com/punctuation/commas.asp
For long term learning and use, I would pick up a proper writer's guide, such as The Holt Handbook, The Chicago Manual or Style, or The Writer's Reference. (These aren't endorsements of these specific books, but rather examples of what I mean when I say a writer's guide.)
Either, anyway, and too are three of the most common words in that class of sentence closers. I struggled for weeks with it. Somebody had actually gone through The New York Times and catalogued the percentages. Closing with "anyway" was preceded by a comma 90% of the time, "too" 80% of the time, and "either" 30% of the time. Say your sentence out loud with and without the comma. What sounds more natural? "Too" should be preceded by a comma in the example "I love you, too" because of the potential for ambiguity between two and too at first glance.
The comma is not necessary in your sentence. The "and" separates the two clauses without it. These links may help:
http://www.grammarly.com/blog/2015/what-is-the-oxford-comma-and-why-do-people-care-so-much-about-it/
http://www.dummies.com/how-to/content/how-to-use-commas-in-a-series.html
